Your 401(k) plan may offer you a variety of investment options, such as stocks, bonds, mutual funds, or target-date funds. These options have different levels of risk and return, and they may perform differently depending on the market conditions and your time horizon. You need to diversify your investments to reduce your exposure to any single asset class or sector and to balance your risk and reward. However, many people make the mistake of not diversifying their investments and putting all their eggs in one basket. For example, some people may invest too much in their employer's stock, which could be risky if the company goes bankrupt or underperforms. Some people may invest too conservatively, which could limit their growth potential and erode their purchasing power. Some people may invest too aggressively, which could expose them to volatility and losses. You should diversify your investments according to your age, risk tolerance, and retirement goals, and adjust them periodically to reflect your changing needs and preferences.